Rupprecht & Patashnick
Series 1105 Monitor
TEOM Technology

The Series 1105 monitor incorporates an inertial balance patented by R&P named the tapered element oscillating microbalance. The key part of this balance is the tapered element. Like a tuning fork, the tapered element (pictured at right with a filter cartridge attached) has a natural resonant frequency related to its dimensions, material and mass. Just as with a tuning fork, if the mass of the tapered element is increased, its resonant frequency decreases. Conversely, if the mass of the element decreases, the system measures a corresponding increase in frequency.

Since the natural resonant frequency is not a function of the electronics, but is inherent to the hollow tapered element that is made from a non-fatiguing material, the mass transducer never requires recalibration.

Tuning forks do not normally change mass, but a tapered element can. Attached to the free end of the element is a disposable filter cartridge (photo at left). As particulate-laden gas passes through the filter the particles become trapped, causing the mass of the tapered element/filter combination to increase. The cleaned gas stream passes down the hollow element and out to an electronic flow control system and vacuum pump. A frequency sensor associated with the tapered element sends information to the Series 1105 microprocessor, where the instrument converts the raw signal to a mass measurement.

The TEOM mass transducer does not require recalibration because it is specially designed and constructed from non-fatiguing materials. Calibration may be verified, however, using an optional Mass Calibration Verification Kit that contains a filter of known mass.

Tapered element technology enables highly precise and accurate mass determinations, providing more resolution than conventional microbalances.

Rupprecht & Patashnick Series 1105 Monitor TEOM Technology

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Rupprecht & Patashnick
Series 1105 Monitor
TEOM Technology